Tube-gripping apparatus for boring wells.



H. G. BREWSTER. TUBE GR ,ING APPARATUS FOR BORING WELLS.

LIoATIon FILED SEPT. so, 1913.

Patented Aug. 11, 1914.

be also given a downward movement m' HARRY C. BREWSTER, OF SHBEVEPORT,LOUISIANA.

TUBE-GRIPIING APPARATUS ron BORING wELLs.

Specification or Letters Patent. P te ted Aug. 1 1, 1914.

Application filed September 30, 1913. Serial No. 792,684.

To all whom it may concern:

Be it known that I, HARRY C. BREWSTER, a citizen of the United States,residing at Shreveport, in the-parish of Caddo and State of Louisiana,have invented certain new and useful Improvements in Tube- GrippingApparatus for Boring \Vells; and I do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My present invention relates to improvements in tube gripping apparatusfor use in boring wells, and is more especially intended to apply toapparatus for boring oil or Artesian wells.

The invention especially relates to the improved gripping rings adaptedto engage the tube and rotate the same while it is being driven down inthe well, and at the same time to permit the tube to moveaxiallydownward whereby the cutting. tools carried by the lower end of the tubemay be both driven in a rotary direction and-may boring the well.

My invention will be understood by ref? erence to the accompanyingdrawing, in which Figure 1 is a plan view, partly in sec tion, of theapparatus; Fig. 2 shows a sec-. tion along the line 22 of Fig. l, andlooking in the direction of the arrows; and Fig. 3 is a perspective viewshowing one of the improved gripping rings and the mode of assemblingthe same on its-spindle.

Like symbols of reference indicate corresponding parts throughout theseveral views.

Referring to the drawings, the operating shaft 1 is driven by anysuitable source of power, and carries a bevel gear 2 meshing in theteeth 3 of the circular revolving table 4 mounted above the fixed table6, and separated therefrom by any suitable antlfriction devices, such asthe cone bearings 5. The fixed table 6 is mounted on the framework 7 ofthe machine, and is pro- ,vided. with a central aperture into whichprojects the cylindrical portion 8 of the rotary table 4, and a setcollar 9 is screwed on this portion 8 to'lock the, rotary table Theroagainst accidental displacement. tary table 4 has attached to orintegral therewith four sockets 11, in which are mounted the sleeves 10internally screwthreaded to engage the screw threads 12 on the ends ofthe mandrel 12, as shown most clearly 1n Fig. 1. These sleeves or nuts10 are rotated by the hand wheels-13.

Slidably mounted on the mandrel 12 are I the backing rings 14, eachprovided with a boss 15 and studs 16, which bossprojects into thecentral cavity 17 and which studs project \into the perforations 18 in.the gripping rings 19. These gripping rings are pre erably made with thetwo beveled faces 20 and with the cuttingedges 20' at eachside of thecylindrical portion 20, and the two sides of the two gripping ringsbeing symmetrical, these rings may be reversed on the mandrel 12 whendesired. On the inner face of each gripping ring I provide a washer ring21 projecting beyondthe edges of the opening 17 in the gripping ring,and between these rings 21, and wherever desired on the mandrel 12,suitable washers 22 areprovided, and the parts maybe approximatelyplaced to grip the tube A, while the final adjustment is efiected bymeans of the hand wheels 13 and the nuts 10 and screw threads 12.

In operation it will be noted that as thetable 4- rotates the grippingrings will firmly engage the tube A and will rotate the same, while thegripping rings, being free to rotate on the mandrel 12, will permit thevertical movement of the tube A.

In making the device, the backing rings 14 maybe made of any suitablematerial, such as'ca'st steel, and the studs 16 may be inserted therein,and forged steel may be used for these studs. The gripping ring 20should preferably be made of tool steel and being reversible as shownwill wear a longtime, and may be reversed whenever desired, and alsowhen much worn it may be taken OE and turned down and used indefinitely.By-having thin tool steel gripping rings suitably braced by the heavybacking rings 14, the wearing parts of the gripping device can be morereadily 'manu factured without cracking, and mount as likely to split orcrack when in useas the larger castings now commonly in use for thispurpose. Moreover, by having gripping rings of this construction, andproperly braced from the rear, cheaper rings may be used, which may bereversed when rendered good backing rings desired, or turned down and asnew, while the heavier cast may be used indefinitely.

Having thus described my invention what I claim and desire to secure byLetters Patent of the United States is V n an apparatusof the characterdescribed, the combination with a mandrel of a solid backing ringslidably mounted there- On, and a gripping ring also mounted on saidmandrel and connected to said backing ring, substantially as described.

In an apparatus of the character described, the combination With amandrel of a solid backing ring slidably mounted thereon, a detachablegripping ring provided with beveled cutting edges also mounted on saidmandrel, and means for securing said gripping ring to said backing ring,substantially as described.

3. In an apparatus of the character described, the combination with a'mandrel of a' solid backing ring slidably mounted thereon,

and a reversible gripping ring also mounted on said mandrel andconnected to said backing ring, substantially as described.

n an apparatus of the character described, the combination with amandrel of a solid backing ring slidably mounted thereon, a detachablereversible backing ring provided with beveled cutting edges also mountedon said mandrel, and means for securing said gripping ring to saidbacking ring, substantially as described.

5. In an apparatus of the character described, the combination with amandrel of a solid backing ring slidably mounted thereon and providedwith a central boss and engaglng pins, and a gripping ring also mountedon saidmandrel and adapted to slip over said central boss and to engagesaid lugs on said backing ring, substantially as described.

6. In an apparatus of the character described, the combination with amandrel of a solid backing ring slidably mounted thereon, and providedwith a central boss and engaging pins, and a detachable gripping ringprovided'with beveled cutting edges also mounted on said mandrel, andperforated to receive said boss and said lugs for securing said grippingring to said backing ring, substantially as described. In'an apparatusof the character described, the combination with a mandrel of a solidbacking ring slidably mounted thereon, and provided with a central bossand engaging pins, and a reversible gripping ring also mounted on said,mandrel and adapted to slip over said central boss and to engage saidlugs on said backing ring, substantially as described.

8. In an apparatus of the character described, the combination with amandrel of a solid backing rin slidably mounted thereon, and providedWill a central boss and engaging pins, and a detachable reversible bacing ring provided with beveled cutting edges also mounted onsaidmandrel, and perforated to receive said boss and said lugs forsecuring said gripping ring to said backing ring, substantially asdescribed.

In testimony whereof, I afiix my signature, in presence of twowitnesses.

HARRY O. BREWSTER. Witnesses:

C. B. TURNER, A. BATEMAN.

